okay, i have done dxm at least a dozen times over the past two or three years. i usually take about 300 ml and have a fine old time. however, the past couple times have been completely disappointing. a year ago, i drank some zicam (which i have also done before with good results) and didnt feel a thing, just puked. then, a few days ago, my boyfriend and i took 350 ml each and did not feel anything at all. anything! except he felt a little nauseas and threw up, but other than that it was very uneventful. does anyone have any idea whats going on??